Athabasca ARK HGND filter, which has the obvious boundary between gray area and transparency area. It is suitable for taking photos of the landscapes. HGND filter is suggested when taking photos for sea, plain and grasslands which has obvious boundary between sky and ground.

Athabasca ARK HGND filter uses German Schott optical glass, with multi-ultrathin noble metal coating, it has the advantage of low reflection, and low color deviation. Also it adopts double-layer water repellent coating, it is really water repellent, scratch and stain resistant.